package com.ithema.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.ithema.reggie.common.BaseContext;
import com.ithema.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录  过滤器
 */
@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER =new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1 获取本次请求的URI
        String requestURI = request.getRequestURI();

        log.info("拦截到请求： {}",requestURI);

        String[] urls=new String[]{ //老子是真服了  请求路径少加了一个/找了一天
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",  //老子是真服了  请求路径少加了一个/找了一天
                "/user/sendMsg",  //移动端发送短信
                "/user/login"   //移动端登录
        };

        //2 判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3 如果不需要处理，直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1 判断登录状态，如果已登陆，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));

          Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

           /* long id = Thread.currentThread().getId();
            log.info("线程id:{}",id);
            */


            filterChain.doFilter(request,response);
            return;

        }
        //4-2 判断登录状态，如果已登陆，则直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

           /* long id = Thread.currentThread().getId();
            log.info("线程id:{}",id);
            */


            filterChain.doFilter(request,response);
            return;

        }
        log.info("用户未登录");
        //5 如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url:urls) {
            boolean match=PATH_MATCHER.match(url,requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
